ABB DSMB 175 57360001-KG Redundant channel card

Command NAK Response The Command NAK Response may be sent by a responder to any command received on the command port that is in error. Use of the Command NAK allows the responder to give more precise and detailed information about the nature of the error to the requester. The Command NAK shall not be sent in response to a NAK message. The NAK message is returned to indicate a syntactic error in a request message. It should only be used if the request is unintelligible. Thus, whenever possible, the corresponding response to a received request message shall be returned.

Read Request

 The Read Request PDU is used to request the contents of one or more contiguous groups of memory from a specific peer controller. The header defines parameters which apply to all of the individual cell references in the message. Each cell reference specifies an offset into the specified exchange or targetspecific address and the number of bytes to read. Based on the address type, the Domain ID must contain an Exchange and Producer ID or target-specific address which is valid on the destination node. A Read Request sent from a requesting node must be followed by a Read Response message from the responding node.The following two items are referred to as the exchange Cell. Each Cell targets one [EGD Exchange] command line present in the EGD module’s configuration file. Offset: reads the DB Register specified in the Command. Length: is Bytes count, not Words. Multiple Cells may be requested dependent on the Cell Count field specified above.

Read Response 

The Read Response PDU (Read_Resp) is used to return the contents of one or more contiguous groups of memory from the local node to the requesting controller. The header defines parameters which apply to the all of the individual cell references in the message. Each cell reference specifies an offset into the specified exchange, the number of bytes of data, and the data itself. All data returned must be padded to the nearest 4-byte boundary.The following four items are referred to as the exchange Cell. Each Cell contains data from one [EGD Exchange] command line present in the EGD module’s configuration file. Offset: reads the DB Register specified in the [EGD Exchange] command. Length: is Bytes Qty, not Words. Multiple Cells may be returned dependent on the Cell Count: field specified in the requesting PDU

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